rswiki-book/377-Construct-Map-Region.mediawiki

[[Category Packet]]
[[Category Packet 377]]
{{packet|name=Construct Map Region|description=Creates a map region.|opcode=53|type=Variable|length=89|revision=377}}
== Interface Animation ==

=== Description ===
Sets the animation for a model on an interface.

=== Packet Structure ===

{| border=2
! Data type
! Description
|-
| [[Data Types#Non Standard Data Types|Big Endian]] [[Data Types#Standard data types|Short]] [[Data Types#Non Standard Data Types|Special A]]
| Map Region Y (absolute Y coordinate / 8 + 6)
|-
| [[Data Types#Standard data types|Bit Block]]
| 1 bit (0 or 1) to decide if a tile exists. 26 bits for data about the tile (only if it exists)
|-
| [[Data Types#Non Standard Data Types|Big Endian]] [[Data Types#Standard data types|Short]] [[Data Types#Non Standard Data Types|Special A]]
| Map Region X (absolute X coordinate / 8 + 6)
|-
|}

=== Information ===

The size of the packet will vary based on whether a tile exists or not. This means that the smallest size of the packet will be 89 bytes but could vary as high as 2285 bytes.

If the tile exists then a 1 gets written to the output stream as a 1 otherwise a zero gets written to the stream.

If the tile does exist then you would follow that 1 bit with 26 bits of information about the tile.

 int info = inStream.readBits(26);
 int unknown = info >> 24 & 3;
 int unknown = info >> 1 & 3;
 int regionX = info >> 14 & 0x3ff;
 int regionY = info >> 3 & 0x7ff;

=== Implementation ===

 for(int z = 0; z < 4; z++) {
      for(int x = 0; x < 13; x++) {
           for(int y = 0; y < 13; y++) {
                outStream.writeBit(1, tileExists ? 1 : 0);
                if(tileExists)
                     outStream.writeBits(26, TILE_INFORMATION);
           }
      }
 }